Pencil



Nov. 27, 1928.

F. J. vlERLlNG PENCIL Filed June 5, 1926 Patented 'Nom 27, 1928.y

UNITED STATES. 'PATENT OFF-ICE.

FRANK J. VIERLING, OF MINNEAEOLS, MINNESOTA, ASSIGNOB TO'ICLOVER G. IRVNE, n

OF MINNEAPOLIS, MINNESOTA.

. A BENGIL.

Application led June 3,

This invention relates to pencils of the automatic type, .and specifically to a pencil of that classjwherein the writing point of the contained` lead maybe advanced or retracted by a screweth'readed action between two telescoping members, the inner member carrying the lead. 1n vaddition thereto the invention includes means permittinv` a step-by-.step advance of the lead towarcs writing position, under the influence of pressure tending to cause telescopic movement of said members, the one Within the other.

' 1t is the primary object of the invention to produce a pencil such as described,vwhich may be economically manufactured, which will operate with a maximum of eiliciency, and in which the number of the parts are reduced to the minimum.

Other objects of the invention will be made apparent in the following specifications when read in connectionwith the accompanying drawings forming a part thereof.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is an elevation of the improved pencil;

Fig. 2 is a view principally in longitudinal central section;

Fig. 3 is a transverse section` taken on the line 3 3 of Fig. 2, on an enlarged'scale; and

- Fig. 11 is a fragmentary detail viewr principally in section taken on the line 1--4 of Fig. 3.

The improved pencil comprises a casing made up of telescopically connected inner and outer members 5 and 6, the latter being 'of resilient material, and a lead holder 7. The outer end of the casing member 6 is contracted to a point 8 through which the leads held by the holder 7, are projected. The'outer end of the casing member 5 is circumferentially expanded to afford a seat 9 for a cap-like holder 10 in which is mounted an eraser 11. rThis holder 10 provides a displaceable closure for the rear end of the casing member 5.

A disk-like partition 12 is rigidly secured in the casing member l5 and is spaced from the holder 10. The casing member 5 between the holder 10 rand partition 12, forms a spare lead compartment 13. The holder 7 is in the form of a longitudinally split sleeve aXially located in the casing member 6 and rigid- 55, ly secured to the partition 12 by a rod 14.

1926. Serialr No. 113,450.

Said lead holder 7 has its inner end portion telescoped onto the rod 141 and rigidly secures thereto, and which rod affords a stop or an abutment for the lead m in the holder 7.

The casing members 5 and 6 are connected for relative axial movement by co-operating cam-actingratchet loclr elementswhich vinclude a circumferential bead 15 on the interior of the casing member 6 and circumferential axially spaced corrugations 16 on the exterior of the casing member 5. These lock elements 15 and 16 are formed by being pressed directly from the respective casing members 5 and 6.

The casing member 5 is longitudinally split at 17 transversely through the lock elements 16 to permit circumferential contraction thereof. Said lockelement 15 is adapted to enter any one of the loclr elements 16 to hold the casing members 5 and 6 in different axial adjustments in respect to each other. By applying slight axial pressure to both casing members 5 and 6 in opposite directions, said casing members may be relatively axially adjusted by a step by step movement produced the lock element 15 successively cntering the lock elements 16. l/Vhen pressure is applied to both casing members 5 and 6 in opposite directions, the lock element 15 and engaged corrugation 16 will be cammed out of interlocking engagement, the walls defining the slot 17 yielding under such pressure, and the lock element 15 will enter the adjacent corrugation 16. Vhile the lock elements 15 and 16 are interlocked the casing members 5 and 6 are free for relative turning movement.

l/Vhen the lead becomes worn it may be further projected by applying pressure to both casing members to move the lock element 15 into the next lock element 16. The spac ing of the lock elements 16 is such that the lead m is always projected a predetermined distance outward from the point 8. Access may be had to spare'leads in the compartment 13 by removing the holder 10 containing ing member 6 and to uncover said passagevway it is only necessary to axially draw said members apart a relatively short distance.

To deflect the spare leads through the passageway 18 the casing member 5 is provided with an oblique false bottom 19. By axially separating the casing members 5 and 6 the holder 7 is withdrawn from the Casing member 6 so that a new lea-d may be inserted therein. The interlocking engagement between the members 15 and 16 is such that the casing members 5 and 6 will be positively heldv against relative axial separation under a pressure applied to the leads during the writing action.

What I claim is:

1. A pencil comprising a barrel carrying a bead and a tubular shell telescopically slidable therein, said shell being composed of resilient material and provided with a helical thread on its inner portion adjacent said open end7 adapted for inter-engagement with said bead, and a smooth portion extending beyond the end of said barrel, the inner portion of said shell being longitudinally slotted transversely of said thread and through said open end, and a lead carrier mounted on said shell substantially as and for the purpose set forth.

2. A pencil comprising` a barrel and shell vtelescopically mounted therein, a spare lead compartment in said shell, said compartment having a. bottom wall sloping to one side, a lead passageway extending through the side of said shell at a point-.adj arent the lower edge of said wall, and a removable closure tor the upper end of said compartment.

ln testimony whereof I attix ymv signature.

. FRANK .1.VVIERLING. 

